Accurately estimate lambing dates, track pregnancy milestones, and monitor fetal development progress.
Breeding Details
Average gestation is typically 147 days (approx. 5 months).
Lambing Timeline
Estimated Due DateJan 24, 2027
Likely WindowJan 19 - Jan 29
Days Remaining147
Total Days147Days
Lambs are typically born 142–152 days after breeding.
Relative Fetal Weight Growth (%)
*Fetal growth accelerates significantly in the final trimester.
About this calculator
Understanding Sheep Reproduction
The gestation period for a ewe (female sheep) averages 147 days, though it can range from 142 to 152 days depending on the breed, age, and litter size. Early maturing breeds (like Finn sheep) often have slightly shorter gestations, while fine-wool breeds (like Rambouillet) may carry longer. Knowing the due date is critical for preparing the lambing jug, ensuring proper nutrition, and scheduling vaccinations.
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Pro Tips
Scanning: Ultrasound scanning between day 70-90 is the gold standard to count fetuses (singles, twins, triplets) for rationing.
Nutrition Boost: Since 70% of fetal growth occurs in the last 6 weeks, increase energy and protein intake to prevent pregnancy toxemia.
Crutching: Shear wool around the vulva and udder 3-4 weeks before due date to aid nursing.
Watch the Udder: Bagging up (udder swelling) usually happens 1-2 weeks before birth.
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Fun Facts
"Sheep have a 17-day estrus cycle, meaning they can be bred every ~17 days during their season."
"70% of the lamb's weight is gained in the final 6 weeks of pregnancy."
"Ewes carrying twins or triplets often have slightly shorter gestation periods than those carrying singles."
"A 'lambing storm' is a real phenomenon where barometric pressure drops often trigger mass labor in the flock."
"Lambs can identify their mother by her bleat (call) almost immediately after birth."
